Showing papers in "Earth and Planetary Science Letters in 1987"

TL;DR: In this paper, the authors developed techniques to measure the abundance in corals by isotope dilution mass spectrometry and showed that 6 × 10^8 atoms of coral can be measured to ±30 ǫ (2σ) and 2 × 10 ǔ(10) atoms of corals to ± 2ǫ.

TL;DR: In this article, the authors present a model for calculating the amounts of melt that may be formed by fluid-absent breakdown of micas and amphiboles in common crustal rock types (pelitic, quartzofeldspathic, intermediate and mafic).

TL;DR: In this article, the authors measured the dihedral wetting angle, θ, resulting from 5-day annealing periods at 950-1150°C and 1 GPa.

TL;DR: In this paper, the authors investigated the properties of rutile-saturated melts ranging from basalt to rhyodacite and found that dissolved TiO 2 is positively correlated with T and not strongly dependent on P total.

TL;DR: In this paper, a detailed mapping of three localities of the Caledonian mountain chain was carried out and it was shown that eclogites account for up to 30-45% of the volume of the rock volume.

TL;DR: In this paper, the C3He ratios of the relevant reservoirs are considered and it is shown that this ratio is unfractionated during magma outgassing, a best estimate being 2 × 109.

TL;DR: In this paper, an Earth model based on four reservoirs: atmosphere, continental crust, upper mantle and lower mantle was explored, where mass balance equations, the concept of mean age of outgassing and the systematic use of all of the rare gases involving both absolute amount and isotopic composition were employed.

TL;DR: In this paper, a general set of 2-D equations for the conservation of mass and momentum of a two-phase system of melt in a deformable matrix is used to derive analytic solutions for the corner flow of a constant porosity melt-saturated porous medium.

TL;DR: In this article, the relative flux of North Atlantic Deep Water (NADW) out of the Atlantic can be monitored in the Southern Ocean, where high NADW mixes rapidly with low δ13C recirculated Pacific water before forming Antarctic Bottom Water (AABW).

TL;DR: In this article, two principal diagenetic reactions have been identified: preferential Ce enrichment (positive Ce anomalies) and preferential heavy REE enrichment (light REE removal) in the pore waters are associated with redox cycling of Fe and Mn within the upper few centimeters of the sediment.

TL;DR: In this paper, the authors report 143 Nd/ 144 Nd and 87 Sr/ 86 Sr isotopic data for Lower Paleozoic brachiopod and conodont fossils.

TL;DR: Fission track analysis of apatites from basement rocks of the Wright Valley in southern Victoria Land provides information about the timing, the amount and hence the rate of uplift of the Transantarctic Mountains in this area as discussed by the authors.

TL;DR: In this paper, the surface ocean conditions near Bermuda may be reliably reconstructed from the coral data via a lead distribution coefficient of 2.3 for the species,Diploria strigosa.

TL;DR: In this article, a study was carried out on the vaporization of a totally molten silicate magma of chondritic composition heated into the range of 2500-3500 K. The results were used to determine the changes in the composition of the mantle that would occur in the Mercury protoplanet should that body have been subjected to the high-temperature phase in the evolution of the primitive solar nebula.

TL;DR: In this paper, the mineral proportions and density profiles in the subducting oceanic lithosphere, modelled by a combination of 80% harzburgite + 20% primitive MORB compositions are calculated as a function of depth under conditions isothermal with surrounding pyrolite mantle, and also for a temperature distribution in which the slab is substantially cooler than surrounding mantle to below 700 km.

TL;DR: In this paper, the authors used the shape of the REE spectra and the size of the Ce anomaly to determine the depth of deposition in the Late Cretaceous/Eocene fish teeth from Morocco, which is consistent with the evolution of sediment chemistry and microfauna associations.

TL;DR: In this paper, the thermal evolution of continental crust during active collision is modeled through numerical solutions of the two-dimensional heat conduction equation for a rapidly moving medium, and boundary conditions used in the modeling are derived from geological and geophysical observations from the active collision zone in the South Island of New Zealand.

TL;DR: The internal structure and growth history of diamonds have been investigated by the study of carbon isotopes and the abundance, isotope composition and aggregation state of nitrogen as mentioned in this paper, which suggests that the octahedral diamonds represent a variety of growth events separated in time and space and that the diamonds resided in the lithosphere for a period sufficient for thermal maturation.

TL;DR: In this article, the authors used deep CTD/transmissometer tows and water bottle sampling to map the regional distribution of the neutrally-buoyant plumes emanating from each of two major vent fields on the Southern Symmetrical Segment (SSS) and Endeavour Segment(ES) of the Juan de Fuca Ridge.

TL;DR: In this article, an ice-rich long-period comet and a much smaller rock-metal asteroid are considered, and it is shown that the supersonic plume of water vapor and rock produced on impact does shock the atmosphere up to global scales and the shock is of sufficient intensity to produce abundant nitric oxide.

TL;DR: In this article, an unusually low delta N-15 found in early to middle Cretaceous beds rich in marine organic matter from two separate eastern Atlantic Ocean basins is reported, which constitutes unambiguous evidence that the N contained in these strata is the end result of biogeochemical processes that differed substantially from those that operated on the contained in intervening organic carbonpoor strata and younger marine sediments.

TL;DR: In this paper, the authors identify the zones in which the cupriferous pyrite deposits of Cyprus were precipitated from hydrothermal solutions derived by interaction of contemporaneous seawater with hot mafic rock at the ancient Troodos spreading centre.

TL;DR: In this article, five samples from a biotite-hornblende granodiorite phase of the 42.5 Ma Quxu pluton, Gangdese batholith, southern Tibet, have been collected at 250 m vertical intervals.

TL;DR: In this article, a numerical model for the diagenetic exchange of Sr between carbonates and their pore fluids during sedimentation and compaction has been developed and applied to data from DSDP Site 590B in order to assess the accuracy with which the Sr isotope record in the carbonate sediment reflects that of seawater.

TL;DR: In this article, the authors proposed a numerical method to study the kinematics of seismic faults provided by focal mechanisms, which is based on the simple mechanical model used for fault population analysis.

TL;DR: In this article, the parent and daughter element ratios and parent-and daughter element concentrations in 34 volcanic rocks from Samoa were reported and the most striking feature of the post-erosional data is a negative correlation between 207 Pb/ 204 Pb and 206 Pb+204 Pb.

TL;DR: The results of these experiments indicate that ∼ 8-10% of the aluminum in atmospheric aerosols of crustal origin over the North Pacific is soluble in seawater as mentioned in this paper, indicating that dissolution of aerosol aluminum is an important source of dissolved aluminum to these waters.

TL;DR: In this paper, a suite of hydrothermally altered gabbros recovered just south of the eastern intersection of the Kane Fracture Zone and the Mid-Atlantic Ridge, record the highest homogenization temperatures yet reported for mid-ocean ridge hydrothermal systems.

TL;DR: In this article, the authors analyzed fossil magnetosomes from living magnetotactic bacteria and found that they were morphologically similar to those from living bacteria, but seemed to be corroded in some cases.

TL;DR: In this paper, a suite of well-documented mantle-derived xenoliths from the French Massif Central are presented, showing a wide range of textures from undeformed protogranular material through porphyroclastic to equigranular and recrystallised secondary types.